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Finding the Fourth Proportional to 715.86, 1,073.86 and 345.56

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Solution

The fourth proportional to 715.86, 1,073.86 and 345.56 is: 518.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.86 : 1,073.86 = 345.56 : x
  2. Step 2: Convert to fraction form
    715.86/1,073.86 = 345.56/x
  3. Step 3: Cross multiply
    715.86x = 1,073.86 × 345.56
  4. Step 4: Simplify right side
    715.86x = 371,076.83
  5. Step 5: Solve for x
    x = 371,076.83/715.86
  6. Step 6: Final answer
    x = 518.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.